6-ounce, 100% US cotton. 50/50 cotton/poly (Dark Heather, Safety Pink, Safety Green, Safety Orange, Heathered Cardinal, Heathered Indigo, Heather Navy, Heather Sapphire). 99/1 cotton/poly (Ash). 90/10 cotton/poly (Sports Grey, Antique Cherry Red, Antique Irish Green, Antique Royal). Prepared for dying (PFD) fabric which means there are no starches, sizing or finishes on the fabric. Non-topstitched, classic width, rib collar. Taped neck and shoulders. Classic fit, seamless body. Recycled, high-performing black tear-away label.